/*
    Copyright 2008 Christian Henning
    Use, modification and distribution are subject to the Boost Software License,
    Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
    http://www.boost.org/LICENSE_1_0.txt).
*/

/*************************************************************************************************/

#ifndef BOOST_GIL_EXTENSION_IO_BMP_SUPPORTED_TYPES_HPP
#define BOOST_GIL_EXTENSION_IO_BMP_SUPPORTED_TYPES_HPP

////////////////////////////////////////////////////////////////////////////////////////
/// \file
/// \brief
/// \author Christian Henning \n
///
/// \date   2008 \n
///
////////////////////////////////////////////////////////////////////////////////////////

#include <boost/mpl/not.hpp>
#include <boost/type_traits/is_same.hpp>

#include <boost/gil/channel.hpp>
#include <boost/gil/color_base.hpp>

#include <boost/gil/extension/io_new/detail/base.hpp>

namespace boost
{
namespace gil
{
namespace detail
{

// Read support

template< typename Channel
, typename ColorSpace
>
struct bmp_read_support : read_support_false
{
    static const bmp_bits_per_pixel::type bpp = 0;
};

template< typename BitField
, bool     Mutable
>
struct bmp_read_support< packed_dynamic_channel_reference< BitField
            , 1
            , Mutable
            >
            , gray_t
            > : read_support_true
{
    static const bmp_bits_per_pixel::type bpp = 1;
};

template< typename BitField
, bool     Mutable
>
struct bmp_read_support< packed_dynamic_channel_reference< BitField
            , 4
            , Mutable
            >
            , gray_t
            > : read_support_true
{
    static const bmp_bits_per_pixel::type bpp = 4;
};


template<>
struct bmp_read_support< bits8
            , gray_t
            > : read_support_true
{
    static const bmp_bits_per_pixel::type bpp = 8;
};



template<>
struct bmp_read_support< bits8
            , rgb_t
            > : read_support_true
{
    static const bmp_bits_per_pixel::type bpp = 24;
};


template<>
struct bmp_read_support< bits8
            , rgba_t
            > : read_support_true
{
    static const bmp_bits_per_pixel::type bpp = 32;
};


// Write support

template< typename Channel
, typename ColorSpace
>
struct bmp_write_support : write_support_false
    {};

template<>
struct bmp_write_support< bits8
            , rgb_t
            > : write_support_true {};

template<>
struct bmp_write_support< bits8
            , rgba_t
            > : write_support_true {};

} // namespace detail


template< typename Pixel >
struct is_read_supported< Pixel
            , bmp_tag
            >
            : mpl::bool_< detail::bmp_read_support< typename channel_type< Pixel >::type
            , typename color_space_type< Pixel >::type
            >::is_supported
            >
{
    typedef detail::bmp_read_support< typename channel_type< Pixel >::type
    , typename color_space_type< Pixel >::type
    > parent_t;

    static const typename bmp_bits_per_pixel::type bpp = parent_t::bpp;
};

template< typename Pixel >
struct is_write_supported< Pixel
            , bmp_tag
            >
            : mpl::bool_< detail::bmp_write_support< typename channel_type< Pixel >::type
            , typename color_space_type< Pixel >::type
            >::is_supported
            > {};

} // namespace gil
} // namespace boost


#endif // BOOST_GIL_EXTENSION_IO_BMP_SUPPORTED_TYPES_HPP
